Creating a point-in-time copy of data volumes – HP XP Continuous Access Software User Manual
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NOTE:
If you select pairs with PAIR status and pairs with other than PAIR status in the
same consistency group, an unexpected suspension might occur during the pair operations
(Pairsplit-r, Pairsplit-S, and Pairresync) under heavy I/O load conditions. You can estimate
whether the I/O load is heavy or not from the frequency of host I/Os. The pair operations
should be performed under light I/O load conditions.
◦
Group: All pairs in the same consistency groups as the selected pairs are deleted.
CAUTION:
Do not use this option when deleting pairs at the secondary array during
disaster recovery.
NOTE:
If the following conditions are satisfied and you click Apply, a warning message
appears and processing cannot continue:
–
The Preset list contains two or more pairs belonging to the same consistency group.
–
The Range column displays Group for at least one of the above pairs.
To continue processing, do one of the following:
–
Ensure that the Range column displays LU for all pairs in the same consistency group.
–
In the Preset list, select all but one pair in the same consistency group, right click the
selected pairs, and select Delete.
•
Delete Mode: Specifies whether pairs are forcibly deleted. When the status of the pairs to be
deleted is SMPL, Suspending, or Deleting, the default is Force. Otherwise, the default is Normal.
◦
Force: Pairs are forcibly deleted even if the primary array cannot communicate with the
secondary array. Use this option to free a host waiting for device-end from a primary
array that cannot communicate with the secondary array, allowing host operations to
continue.
If you specify Force when the pair status is other than SMPL, Suspending, or Deleting,
Range is set to Group.
◦
Normal: Pairs are deleted only if the primary array can change the pair status of the
primary and secondary data volumes to SMPL.
•
Set: Applies settings in the Preset list in the Pair Operation pane (
).
•
Cancel: Discards settings.
Creating a Point-in-Time copy of data volumes
Use XP Continuous Access Journal to make Point-in-Time (PiT) duplicates of groups of volumes. The
term Point-in-Time (PiT) refers to the process of copying data immediately when you want to obtain
it. Use XP Continuous Access Journal to create a PiT copy of data volumes belonging to a journal
group.
1.
Stop all write I/Os from hosts to primary data volumes in the journal group. Stop all host
updates to all XP Continuous Access Journal primary data volumes in the group.
2.
After all write I/Os to primary data volumes are stopped, split the mirror (that is, a pair of the
master and restore journal groups, see
Splitting mirrors (Pairsplit-r: suspending copy
). When splitting the mirrors, use the Pairsplit-r pane, specify Group for Range,
and specify Flush for Suspend Mode.
3.
When the status of all data volume pairs in the journal group changes to PSUS, the duplicate
set of volumes is complete. If desired, restart your business application at the primary site to
resume business activities.
Creating a Point-in-Time copy of data volumes
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